Delta PG-40 Specifications download pdf (Page 10)

10 LTL-X Retrometer DELTA

User select (user initials)

If a user icon is displayed in the upper icon row on the measuring display, press the

UP button ▲and if necessary ◄ or ► to mark the user icon. Press the OK button to enter

the user select menu. For further information see Selecting a user id, pg. 21

Series ID select (name)

From the HOME screen (measure display) press the UP button ▲to mark the road icon

. Press the OK button to enter the series ID select menu. Select a name from the list

using UP or DOWN and accept with OK.

Calibration

The instrument is supplied with two calibration units, a reference calibration unit (black)

and a field calibration unit (red). The reference calibration unit is factory calibrated and

traceable to PTB. The field calibration unit must be calibrated against the reference calibra-

tion unit by the user at suitable intervals. The reference calibration unit is stored in the

black protection box, and the field calibration unit in the grey protection box.

Two steps are required for a complete calibration, zero calibration and reference calibra-

tion. The instrument will guide you through the procedure.

Calibration procedure

 Zero calibration

Press the CALIBRATION button once. Mount the calibration unit underneath the front

end of the instrument by tilting the instrument slightly backward. Make sure that the end

pins on the side of the calibration unit fit into the slots in the LTL-X.

It is important that the calibration unit faces with the dark opening toward the instrument

tower. The display will show the correct orientation of the calibration unit. Make sure that

the calibration unit and the light trap is clean. Press the OK button to start zero calibration

(black calibration). During calibration the lamp will flash a number of times.

 Reference calibration

After zero calibration, the instrument is ready for the reference calibration (white calibra-

tion). The display will tell you to turn the calibration unit so that the white face is facing

the instrument tower. Again, it is important that the pins on the side of the unit fit into the

slots in the LTL-X. Press the OK button to start reference calibration. Check the value dis-

played, and if necessary, adjust the calibration value shown in the display so it matches the

value stamped on the calibration unit.

Press the OK button to perform the calibration.

The calibration procedure is now complete. Remove the calibration unit and store it properly.

Press OK to return to the measurement display. For further details see pg. 45.

Control Calibration.

Use in case of doubt during on site measurement. Follow the traceable calibration procedure

using the red control calibration unit. Use the Rl value from the control calibration unit label.

Transfer of calibration value.

At regular intervals the traceable calibration value must be transferred from the reference cal-

ibration unit to the control calibration unit.

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Delta PG-40 Specifications Page 10